Stop me if you've heard this plot before: Wife leaves hubby because he's become too boring and inattentive. Hubby must somehow reconnect with the youthful self she fell in love with in order to win her back.
In the interim, the writer and director have to come up with a bunch of "funny" stuff to happen to Hubby before he finally achieves his goal. This includes him learning to be a stud and hooking up with a host of really unappealing ladies, including Jenna Elfman as his sushi-crazed secretary and Janeane Garofalo as an unorthodox Orthodox Jew. But the "funny" stuff is on the order of him going nuts at an 80's Karaoke night, and bowling badly while under the influence of cannabis fudge. I'd call these scenes "funny-adjacent" rather than funny. They're similar to scenes you'd find in a funny movie, minus the laughs.
Bottom Line: Richard Grant is no Hugh Grant, but this film is watchable--just.